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Program Accuracy

dhoughton
I've been programming CMMs for about 8 years now programming in PC-DMIS for almost 2 years. I've been interviewing for a programming position's lately because I'm moving and I keep getting asked how do I know the program data is correct or accurate. I haven't really been asked this before and I've been saying that I check the data of my features used for alignment and calibration results but I'm not sure if this is the right way of checking.

Does anyone know if this is correct or if there is a better way to check the accuracy of the data generated from a program?

Thanks
Parents
  • Check some parts (sampling of linear dimensions in all three axes and sampling of diameters) with tools other than the CMM and compare the results (enter the data in an MSA form).

    Run the same part 3 times and enter the data in an MSA form.

    You can do it without the MSA form (and should) for all your programs.

    You are checking the machine to still be ok since calibration and checking your programming methodology.

    If you only use dimensions checked on the floor by operators and use their data against your CMM data, if there is a difference, you can fix all sorts of measurement problems on the floor and in inspection.
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  • Check some parts (sampling of linear dimensions in all three axes and sampling of diameters) with tools other than the CMM and compare the results (enter the data in an MSA form).

    Run the same part 3 times and enter the data in an MSA form.

    You can do it without the MSA form (and should) for all your programs.

    You are checking the machine to still be ok since calibration and checking your programming methodology.

    If you only use dimensions checked on the floor by operators and use their data against your CMM data, if there is a difference, you can fix all sorts of measurement problems on the floor and in inspection.
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